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    <title>Document</title>
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    <p>传统标签</p>
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    <p>HTML5新增标签</p>
    <header>头部</header>
    <nav>导航</nav>
    <article>
        代表一个独立的，完整的相关内容快，例如一篇完整的论文帖子，一篇博客文章，一个用户评论等
        <section>定义文章中的节，比如章节，页眉页脚</section>
    </article>
    <aside>侧边栏</aside>
    <footer>脚部</footer>


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        <ul>
            <li>导航1</li>
            <li>导航2</li>
            <li>导航3</li>
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